It is usually your top threading, do this test. Insert a new needle, (flat side facing rear of machine) then totally rethread. Now with the presser foot up, pull on the top thread, it should feed smoothly. Put the presser down and pull thread again, now it should barely move. This usually seats the thread in the tension discs. I am hoping that it is not your timing because that is not a do it yourself job. You need tools and expertise.

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Related Questions:

If the upper thread is looping on the bottom of the fabric as you sew, the upper tension is too loose. It could be threaded incorrectly, the upper thread may not be seated in the tension disk properly (be sure to RAISE the presser foot BEFORE threading the upper thread), or the upper thread tension is set too loose.

If you have checked everything and it is still looping underneath, the bobbin tension may be too loose or the bobbincase needs replacement.

the bobbin tension is set by that small spring plate that you pull the thread under after you put the bobbin back in the carrier / holder
a very small turn of that screw makes a big difference ob the tension unlike the needle thread tension
mostly the problem ( you never bothered to mention the symptom ) is bird nesting under the fabric which is the needle thread tension not tight enough

try a new needle--one that is for the fabric being sewedthen try to adjust the top thread tension again, if the stitches remain loose and the tension won't adjust then the tension knob needs to be checked to see if there is something wrong with it.also check to make sure the bobbin is inserted correctly into the bobbin case, if the bobbin is not turned the right way in the bobbin case the sewing machine will not stitch correctly.

first let's deal with the needle becoming unthreaded,
Keeping the needle threaded is easy, always keep thread tails of 3 to 6 inches on the top thread & bobbin at all times, & make sure the thread tail are pulled behind the needle before you start to sew,, this will ensure that the thread will not come out of the needle when you start to sew.

you mention the fabric is thin,, do you have a needle that's right for the fabric your sewing?
thin fabric needs a different needle than blue jeans fabric, check your top tension & see what the setting is on, usually 3 to 5 is good.

when the needle & thread are right for the fabric then the sewing is good.

also clean under the needle plate & bobbin area for loose threads or lint

also it's a possibility that the machine could be out of time & would need to be serviced by a sewing machine repair shop-as they have the tools for the job

The tension in the top thread is controlled by a dial, and the tension in the bottom thread is controlled by a small screw on a spring on the bobbin. The tensions are supposed to be exactly equal in order to make the stitch perfectly in the middle of the cloth. Uneven tension will pull the stitch up or down from there. You can tug on each thread to feel how much tension there is. Often the bottom will get too much tension by just inserting the bobbin upside down. Leave the bobbin door open, and watch the operation. The top thread is pulled down around the bobbin. See if it is getting caught on anything?

Hello, sewing is a part of my income and I've encountered this problem before and managed to fix it on my own, by trying out these different things. I re-threaded the machine and checked to make sure that the tension is not too loose. Check the bobin and the sack the bobin fits into, sometimes it comes loose too, click it back into place and re-do the bobin. adjust the tightness of the stiitches, I usually put it on 2 .5 - 3. Hope this helps. Good luck to all. Nefishakh@hotmail.com